Crossword Genius

Back rank is just not good enough (6-4)

Ross

I believe the answer is:

second-rate

'just not good enough' is the definition.

'back rank' is the wordplay.
'back' becomes 'second' (synonyms).
'rank' becomes 'rate' (synonyms).
'second'+'rate'='SECOND-RATE'

'is' acts as a link.

(Other definitions for second-rate that I've seen before include "Substandard" , "Of mediocre quality" , "Shoddy" , "Poor" , "Inferior" .)

I've seen this clue in The Guardian.
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